clinton will leave her post after president obama's inauguration later this month. the president has nominated senator john kerry to replace her. >>> still ahead, how could it happen? the investigative unit asks why a south bay school district violated federal law intended to protect kids from sex abuse. >>> and i'm jeff ranieri in the nbc bay area weather center. temperatures dropping again to the low to mid-30s tonight. that will help fog to form. we'll have your full forecast coming up and our chance of some very rare low bay area snow in just a few minutes. [ fingers tapping ] [ rain pattering ] [ heels clicking ] [ female announcer ] yoplait light tastes great now... ♪ ...and feels great later 20 delicious flavors of yoplait light, now at 90 calories each. yoplait, it is so good! >>> a new study finds that hpv related cancers are on the rise despite protecting against sexually transmitted infections, the american cancer society's latest data shows -- girls under 17 received all three doses of the vaccine. more effort is needed to increase the number of girls